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"Two Concepts of Liberty is one of the Four Essays on Liberty (1969) by Isaiah Berlin. Delivered as a lecture in 1958, it is one of the most famous texts in political philosophy. A remarkable exposition of the core concepts of liberalism, in the context of the cold war, it is also a reflection on our moral universe, in a world where plurality in the ends of humanity is recognized as a most precious good, even more precious than the ultimate harmony in a perfect whole, that has proved to be stained by more blood than it has been enlightened by hope."